Measurements of thermal time constants of radiosonde thermistors were made. Details of the experimental technique are presented whereby time constants were determined at various air speeds up to 2700 ft/min. Results are presented graphically to show the effect of time constant versus air speed with pressure and the corresponding average ambient temperature as encountered in the “average” atmosphere as parameters.

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* The work reported here was done while the author was with the Friez Instrument Division, Bendix Aviation Corp., Baltimore, Md.